From Cppreference
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| typedef /*implementation defined*/ iostate;
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| static constexpr iostate goodbit = 0;
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static constexpr iostate badbit = /*implementation defined*/
static constexpr iostate failbit = /*implementation defined*/
static constexpr iostate eofbit = /*implementation defined*/
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Specifies stream state flags. It is a bitmask type, the following constants are defined:
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| Constant
| Explanation
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| goodbit
| no error
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| badbit
| irrecoverable stream error
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| failbit
| input/output operation failed (formatting or extraction error)
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| eofbit
| associated input sequence has reached end-of-file
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Example
